the 0-1 vector of all \(F(i,c)\)  for \(i\in I_{\lnot T}\)  using the same index
ordering as in \(\mathsf {v}\) . Furthermore, let \(Q(v,w)\)  be some statistical
quantity measuring similarity of two 0-1 vectors \(v\)  and \(w\) . This may be
accuracyAccuracy is the amount of coincident bits of two \(r\) -bit
vectors:
\( \mathrm {accu}(v,w)=\frac{1}{r}\cdot \sum _{i={1}}^{r}\big (v_{i}\cdot w_{i}+(1-v_{i})(1-w_{i})\big )\) 

or—by considering \(\mathsf {F}(c)\)  and
\(\mathsf {v}\)  as two raters of the same feature
vector—Cohen's kappaCohen's Kappa[1]} is used for
measuring agreement of two binary \(r\) -bit raters \(v\)  and \(w\) 
and defined as
\(\mathrm {kappa}(v,w)=\frac{\mathrm {accu}(v,w)-p_{e}}{1-p_{e}}\) 
where
\(p_{e}=\frac{1}{r^{2}}(n_{v_{i}=0}\cdot n_{w_{i}=0} + n_{v_{i}=1}\cdot n_{w_{i}=1}).\) 
, among other possibilities.
